An ablation system comprises a microwave ablation device having a feedline (14) including a distal radiating section, an inner tubular member (35), and an outer tubular member (30). A cooling system is operatively coupled to the microwave ablation device and configured to provide fluid to the microwave ablation device during an ablation procedure. The feedline (14) is within the inner tubular member (35) and the inner tubular member is within the outer tubular member. A first lumen (37) is defined between the feedline and the inner tubular member and a second lumen (33) is defined between the inner tubular member and the outer tubular member to enable fluid flow through the ablation device.
